Thermostat mechanism



Aug- 20, l935. F. H.'scHoENF|-:| D 2,011,691

THERMOSTAT MEGHANISM.

Filed March 8,' 1954 2 sheets-sheet 1 24 IN VEN TOR.

A TTORNE Y.

Aug. 20, 1935. F. H. scHoENFl-:LD n 2,011,691

THERMOSTT MECHANISM Filed March 8, 1954 2 Sheets-Sheet 2 Patented Aug. 20, 1935 l -l UNITED STAT-Es PATENT OFFICE THERMOSTAT MECHANISM Frank H. Schoenfeld, Cleveland Heights, Ohio assignor to The Titan Valve and Manufacturinf Company, Cleveland, Ohio, a corporation Application March 8, 1 934, Serial No. 714,682 16 Claims. (Cl. 236-33) This invention relates to a thermostatically Fig. 1 is an elevation Iof a storage heater for controlled fluid supply means for a fluid heater, water provided with athermostat'mechanism emsuch as a storage water heater, more particularly bodying my invention. to the operating leverage between the thermostat Fig- 2 is a Dian View of the thermostat meenaelements and the fuel inlet valve and the mountnisln, Darts being broken away i ing for the leverage. Fig. 3 is a section on the line 3--3 of Fig. 2

One object of the invention is to provide an showing the position! of the Darts When the Waller improved snap action, multi-leverage thermostat in the tankhas been heated to the desired tiemmechanism in which all of the levers are mountperafure. I 'ed on a support and one lever, by the normal ac- Fig. 4 is an enlarged fragmentary. Section showtion of the leverage spring, is held against the ing the position of the parts when the thermomovable thermostatic element, so that such elestat has operated to open the fuelvsulpiy valve. ment, acting through the leverage, maintains the Fig. 4a is a fragmentary View Substantially support in xed position in the thermostat cassimilar to Fig- 4 but showing the Position of the' ing to insure uniform operations of the leverage Darts in Position due to lOWeling of the tempel'al5 at all times with minimum change in tempera.- ture in the container to an .abnormal-low temture of the medium in contact with the thermoperature.

static elements. Fig. 5 is a fragmentary section on the line 5 5 Another object o f .the invention is to provide of Fig. 3. an improved thermostatically operated, snap ac- Fig. 6 vis a` fragmentary perspective -view of the 20 tion leverage and mounting therefor, so conleverage and its mounting, Darts being broken structed and arranged that the leverage may be away.

assembled ready for insertion in its casing and Figs. 7, 8, and 9 are detail Views of Certain of positioned and removed therefrom as a unit. the Darts shoWn in Fig. 6.

Another object of the invention is to provide` In the drawings, i indicates a Storage Waie1125 an improved thermostatically operated, snap acheater Comprising an insulated tank,` the burner tion leverage and support therefor so constructed vfor a gaseous fuel being below the tank and that bearings, shafts and pivots mounted in or mounted in a casing incorporated' With the inupon the walls of the casing for the leverage are sulatlon for the tank and forming a Combustion eliminated. chamber, thev casing being secured to aring 2 30 Another object of the invention is to provide having Suitable feet 3. 4 indicates a .ue Whoh an' improved thermostatically operated leverage leads through the tank from the combustion of a simplined, compact construction, whereby chamber. 5 indicates the outlet for hot water, its enclosing casing may be made relatively small leading t0 service points or stations. .6 indicates in size and economical in construction. p the Water supply Dine leading from ifhesnPPly 35 A further object of the invention is to provide mains. The parts above described form no part an improved mounting for a multi-leverage of a of my invention and may be of any preferred thermostatic mechanism, capable of supporting Construction and arrangement. the levers independently of the leverage casing, The gaseous fuel is Supplied by apipe i to a whereby the latter may be readily constructed. casing 8. to-be laterreferred t0, and from the cas- 40 A further object of the invention is to provide ing through a pipe 9 t0 the burner armithrough a an improved thermostatically operated, snap acpipe i0 to a suitable Dilot- The pipe?. casing 8 tion leverage and mounting therefor so arranged and pipe 9 form a conduit for the fnel leading that one lever co-acts with one of the thermoto the burner. The Casing 3 is shaped to form a stat elements to maintain the mounting in posi` chamber 9in which iS removably mounted a 45 tion in its'casing, thereby insuring at all times leverage, indicated as an entirety at il, to be an operative relation between the thermostat elelater referred to. The rear wall ofA the casing ment and the leverage and effective response to is providedlwith an integral boss or body meinslight changes in temperature of the medium surber l2, which is in turn provided with a tubular rounding the thermostatic elements. member i3. The free end of the memberi3 is 50 Other objects of the invention will be apparent threaded into the side wall of the tank l, as shown to those skilled in the art to which my invention in Fig. 1. The body portion I2 is formed with a relates from the following description taken in recess le which extends inwardly from one side connection with the accompanying,y drawings, thereof. The side Walls of the recess ,le are wherein formed with openings l5, I6, in axial alinement with the tubular member I3. The walls of the opening I6 are threaded to receive and support the inner end of a tube I1 formed of copper or other material having a high co-eficient of expansion to serve as one thermostatic element. The tube I1 extends through the member I3 into the tank I and its outer end is closed in a liquid tight manner by a plug I8 (preferably a plug threaded into the tube). The plug I8 is formed with a threaded opening, extending axially inwardly from its inner end, and arranged to receive the outer, threaded end of a rod I9, formed of invar metal or other material having a low co-efficient of expansion to serve as the other thermostatic element. The rod I9 extends through the tube I1 and opening I5 into the chamber 9' for engagement with and operation of the leverage II. 20 indicates a device connected to the rod I9 within the recess I4 and extending outwardly to a point of access, as shown at 20a. The device 20 serves as a means for rotating the rod I9, which operation through lthe threaded connection with the plug I8 will move the rod I9 endwise and effect an adjustment between it and the leverage II, so that movement of the rod I9 will actuate the leverage with greater or lesser change in temperature of the water, to control a valve 2l to be later referred to.

In the structural form of the casing shown,

the top wall of the chamber 9 is formed with a threaded opening 25, closed by a plug 26, and its bottom Wall is provided with a nipple 21 to which the pipe 9 is connected.

The conduit for the combustible fluid is shown controlled by a dual valve mechanism comprising a main Valve 28 and a controlling valve 2I (already referred to) which is operated by the leverage II. The main valve 28 consists of a rotary valve element 29 which opens and closes a port 30 formed in a wall 29 and leading from an inlet chamber 3|. The wall 29I and Wall of the inlet chamber 3I are preferably formed integrally With each other and the casing 8. The wall of the chamber 3| terminates in a suitable nipple 33 to which the pipe 1 is connected. By the provision of the chamber 3 I, provision is made for a. valved outlet connected to the pilot pipe I0. For this latter purpose, the wall of the chamber 3| is provided at one side with an integral boss 34 having an opening 35 through it, the pipe I0 being suitably xed in the outer end of the opening 35, its inner end forming a seat for a needle valve 36. The needle valve 36 has a threaded shank threaded in and extending through a plug 31 mounted in the wall at the opposite side of the chamber 3I and a head 38 for turning the valve. The Wall 29 is concentric to an opening 39V through the chamber 9', from which the fuel l flows through the pipe 9 to the burner.

The valve element 29 may be rotated any desired distance, to close the port 30, by a handle 43, but in the preferred arrangement the removal of the valve element 40 and its mounting serves to rotate the valve element 29 and close the port 30 and replacement of these parts serves to rotate the valve element 29 and open the port 30. The, out

er end portion of the valve element 29 is reduced to form an annular exterior shoulder 42 and an annular interior shoulder42a for purposes later set forth. The outer end of the element 29 carrie's the handle 43 by which the element may be rotated manually or automatically as hereinafter described, the handle being of annular shape to permit the removal and replacement of the valve element 49 and its mounting, and may be secured to the valve element 29 in any desired man ner. 46 indicates a collar preferably formed of sheet metal and removably secured to the outer end of the wall 29. As shown, the collar 46 and Wall 29 are provided with diametrically arranged outwardly extending lugs having alined openings to receive screws 41, which secure the collar 46 in position. The outer end of the collar 46 is provided with an in-turned flange 48 which forms the seat or abutment for one end of coiled spring 49, the other end of the spring engaging the shoulder 42 and normally tending to move the valve element 29 inwardly to maintain it in its seat. The handle 43 is preferably formed of sheet metal and shaped to form an inner annular, outwardly flaring wall 50 and an inwardly extending skirt 5I, the latter being of non-circular formation to facilitate gripping thereof when turned manually. The skirt 5I is provided with in-turned members 52 (one only being shown) so arranged that one member engages the head of one screw 41 and the other member engages the head of the other screw 41, whereby these screws serve as stops to limit the rotative movement of the handle 43 and valve element 29. The members 52 are preferably arranged so that the valve element may rotate aquarter turn and in the opening movement thereof it is stopped by the adjacent screw 41 at the point Where the ports 30 and 4I are in registry. The handle 43 may be locked in either position as limited by the screws 41 by means of a spring catch 53 arranged to enter slots 54 formed in the rim or edge of the skirt 5I The latch 53 consists of a resilient strip having a base portion suitably secured to the collar 46 and a portion 53al extending radially therefrom and arranged to ride on the skirt rim and enter one of the slots as shown in Fig. 3. 'Ihe portion 53a extends beyond the handle 43 so that it may be manually pressed inwardly to release the handle. The strip 53 may be secured to the collar 46 by slitting the latter on parallel lines throughout a portion of its circumference to form between the slits a section 46a. This section is distended or exed sufficiently to permit the base portion of the strip to be inserted below it and thus engage with the collar at opposite sides of the section 45a. As the opening through valve element 29 is sealed by the mounting for the valve element 40, as later set forth, no danger of leakage through the slits is present. The mounting for the valve element 40 consists of a member 55 provided with a collar 69 having threaded engagement with the inner Wall of the valve element 29 (see Fig. 4). By means of a suitable gasket 62, which is compressed by the collar into engagement with a shoulder 42a, the opening through the element 29 is gas-tight sealed. When the collar 60 is screwed into position against the shoulder 42a, the closing member is rigidly secured to the valve element 29 and may rotate therewith when turned. By releasing the spring latch 53a, the valve element 29 may b'e turned to close the port 39 or open it. The closing member 55 is hollowed out axially from its inner end to form av chamber 56.]The outer end of the chamber 56 is closed by a plug 51 preferably threaded to the internal wall of the chamber 56. The plug 61 is formed with a through axial opening which forms a guide for a shank 58 fixed at its inner end to the valve element 110. i The outer end of the shank 58 engages with the adjacent end of a coiled spring 59 (being preferably fixed thereto), the opposite end of the spring engaging the end wall of the chamber 56. The spring 59 normally tends to move the valve element against its seat 39a, but is compressed when the valve element 40 is unseated by movement of the`le'verage 1| toward the left, as shown in Fig. 3. The outer end of the closing member 55 is provided with a flange or collar 63 the diameter of which is somewhat larger than that of the collar 66 to permit the positioning over the latter of a ring 66. The ring 64 is preferably slightly resilient and is arranged to be pressed into tight frictional engagement with the handle wall 59 when the member 55 is screwed into final position. Accordingly, when the closing member 55 is rotated in the operation of removing it, the engagement of the ring iid-with the wall 50 will serve to turn the handle 93 and valve element 29 until the handle is stopped by the engagement of one vlug 52 with Vthe adjacent screw 61, thereby closing the port 36; likewise, in the replacement of the closing member 55, the ring 69 will be forced into tight engagement with the wall 58 and operate to turn it until it is stopped by the engagement of the other lug 52 with the adjacent screw |31. If desired, the ring 69 and handle wall 50 may be provided with interlocking elements. From the foregoing description it will be seen that the closing member 55 is detachably connected tothe handle, 63 so that when the member is turned in one direction to remove it, it automatically turns the handle and valve element to close the main valve port 30 and releases itself from the handle; and that when the closing member is replaced and turned to position it in the valve element, the handle is engaged and automatically turned to open the valve port 36. Itwill also be seen that when it is desired to inspect, clean or repair the elements Aof the closing valve, the single operation of unscrewing the closing member, removes the valve element 60 and closes the port 36 and that but one operation is required to replace the valve element lill and open the port 30. The outer end of the closing member 55 is preferably provided with a kerf 65 to receive a tool to facilitate turning of the member.

The valve element 60 is preferably of substantially semi-spherical shape and its seat 39a. is correspondingly ground.

It will be noted that in my construction the valve element for the controlling valve 2| is mounted upon or in the closing member 55 and operates therein independently of the valve element 29. Accordingly, the closing member serves as a removable mounting for the valve element, whereby the latter may be removed and cleaned when desired; and when the member is removed, the valve seat 39a is accessible for cleaning.

The dual valve mechanism or parts thereof form` the subjects-matter of a co-pending application filed by me on March 7, 1934, Ser. No. 714,472, for which reason no claim is made thereto herein.

It will be understood that any desired form of valve mechanism may bel used in connection with my improved thermostat mechanism, the mechanism herein shown being merely for illustrative purposes.

'I'he leverage comprises the following: 66 indicates as an entirety a frame removably mounted in the chamber 9 and held against the front wall thereof by the thermostatic element |9, as later set forth.

- The frame 66 is formed from a section of sheet metal bent on longitudinal lines into substantially U-shape to provide spaced side members 61, having at their upper and lower ends spaced lateral arms 68, 68', and upper and lower cross bars 69, 69', each side member 61 and adjacent arms 68, 68', being in the samev plane and parallel to the other side member and adjacent arms. The front wall of the chamber 9 is engaged by the opposite ends of the cross members 69, 69', as shown in Fig. 5,-above and below the valve opening 39a therein. The upper lateral arms 68 are cut away on their inner edgesl to form angled corners in which seats the upper end of a main lever 1|, such end being cut away at its opposite sides to provide an upwardly extending lipv12 and the cut-aways being .machined to form inwardly beveled edges, which provide knifeedge bearings for the lever. The lip 12 .is arranged between the arms 68 to prevent lateral movement of the lever 1| relative thereto. 13elow the lip 12 the lever 1| is provided with a central recess 13 (preferably constituting a depression in the metal) which forms a seat for the pointed" free end of the thermostatic element i9. Where the lever 1| is formed with a depression to provide the seat 13, the lower edge of the cross member 69 is cut away as shown at 19 to accommodate such depression. Below the seat 13, the lever 1| is formed with an opening 15 through which the valve engaging device .16,

provided on a secondar'yelever 11, operates, asl later set forth. The lever 1| extends downwardv1y to a point within the lateral arms 68 to provide maximum length and its sides are preferably of converging shape toward its lower end, so that such end is free to move between and relative to the spaced legs 18 `of the lever 11. 'I'he lower end of the lever 1| terminates in a laterally extending tail 19. The tail 19 is formed with an opening 80 so that the hook 8| on the end of an extension spring 82 may extend through the opening and connect the spring to the tail 19. The lever 11 comprises the legs 18 disposed in parallel relation and connected at vtheir upper ends by a cross member 83 to which iscentrally connected the valve-operating member 16 and a rearwardly depending lug 83 the purpose of which will be later set forth. The member 16 extends at substantially right angles lto the lever 11 and operates through the opening 15 to engage the valve element fill, as shown in Fig. 4. Thelower ends of the lever legs 18 are bent rearwardly so that their forward transverse edges may make knife edge contact in angle walls 86 provided on the lateral arms 68. The legs 18 of the lever 11 extend beyond the frame side members 61 (see Figs. 5 and 6) to lim-it the movement of the lever rearwardly. The movement of the lever 11 in the opposite direction is limited by the engagement of the cross bar 83 with bthe lever 1| (see Fig. 4). The lug 83 is formed with an opening 84, through which extends the hook 85 on the opposite end of the spring 82, the

spring serving to connect the outer end portions tion to the thrust movement of the thermqstatic element I9 and (b) effect snap action ofthe secondary lever in opposite directions, as later de-,

scribed.

In this arrangement, the thermostatic rod I9 operates through the leverage I I to support it and the frame 66 in a predetermined position in the chamber 9. As the rod I9 is slidably as Well as rotatively supported in the opening I5 and its free end fits into a seat in the lever 1I, the rod I9, lever 1I and fulcrum for the latter are maintained in thesame relation at all times and permit accurate control of the valve 2| to be made by the rotative adjustment of the rod I9. As snap action of the lever is effected by a small movement of the lever 1I, the valve 2I will be opened or closed as a result of slight change in temperature of the surrounding water in the tank I.

vOperation- Fig 3 shows .the position of the leverage II (which position may be termed normal) when the water in the tank I is heated to the predetermined temperature. In this position, an imaginary line cutting the connection of the spring 82 with the levers 1I, 11, lies in an off-center position inwardly of the fulcrum or axis of the latter lever; accordingly, the spring 82, which is under tension, maintains the lever 11 against the side members 61 of the frame 66. If, due to the use of the heated water and supply of cold water to the tank, or otherwise, the temperature of the surrounding water becomes lowered, the contraction of the tube I'I moves the rod I9 endwise, which in turn will move the lower end of the spring 82 outwardly, the eiiect of which is to swing the spring relative to the fulcrum or 'axis of the lever, so that the said imaginary line lies in an off-center position outwardly of said lever fulcrum. Upon movement of the spring 82 to this latter position, it will impart a snap action movement to the lever 11 and thus open the valve 2 I, against its spring, as shown in Fig. 4,

- and permit the combustible fuel to flow into and through the casing 8 to the burner. Upon reheating of the water, the rod I9 will move endwise and permit the lever 1I to move to its normal position, in which movement the lever 'I1 will be snap operated rearwardly and permit the valve element 40 to re-seat and close the opening 39.

I If, following the operation of the leverage II to the Fig. 4 position, the temperature of the Water continues to drop, the contraction of the tube I1 will move endwise toward the left the rod I9 which in turn will swing the lever 1I about its fulcrum vto accommodate such movement of the rod, as shown in Fig. 4a. As the lever 11, in this further movement` of the lever 1I, is held in engagement therewith by`the spring 82, it moves therewith and through the member 16 moves the valve element `40 away from its seat a greater distance. This operation of the valve will admit `more gas to the burner unless the valve 9m has been adjusted to a predetermined ow of fuel.

From the foregoing description it will be noted that both the main or thermostatic element engaging lever 1I and the secondary or valve operating lever 11 are fulcrumed on spaced knife edge bearing points, that the spring 82 is centrally connected to these levers in a plane between such bearing points and that the engagement of the thermostatic element I9 with the lever 1I and engagement of the lever 11 with the valve element 40 are in this same plane. It will also be noted that the levers 1|, 1 I, are arranged in .side by side relation and fulcrumed on the frame at their respective remote ends, so that the spring 82 being connected to their free end portiers serves to maintain the levers in engagement with their knife-edgey bearings. Furthermore, in all positions of the levers, the spring normally tends to swing the lever 1I toward the rod I9 to malntain engagement therewith.

To those skilled in the art to which my invenn relates, many changes in construction and widely differing embodiments and applications of the invention will suggest themselves without Ydeparting from the spirit thereof. My disclosures and the description herein are purely illustrative and are intended to be in no sense limiting.

What I Claim is:

1. In a thermostat mechanism, the combination with a casing forming a chamber and provided With an outlet leading therefrom and a valve for controlling the flow of a uid into said chamber, of a frame removably mounted in said chamber, a leverage,'including a spring for effecting snap action of the lever which operates said valve, mounted in said frame, and a thermostatic element extending into said chamber and engaging another lever of said leverage to operate the latter and operating through said leverage to maintain said frame in position.

2. In a thermostat mechanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom, a valve for controlling the ow of a fluid into said chamber and a thermostatic element, of a frame removably mounted in said chamber, a. leverage, including a spring for effecting snap action of the lever which operates said valve, mounted in said frame, said element being in engagement with one of said levers and operating through the leverage to support the frame in position in said chamber.

3. In a thermostat mechanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom', a valve for controlling the ow of a uid into said chamber and a thermostatic element, of a frame removably mounted in said chamber and comprising a pair of spaced side members having at its opposite ends laterally extending connected portions forming pairs of spaced supports, a lever having fulcrum engagement with one pair of said supports and arranged to, be operated by said thermostatic element, a lever having fulcrum engagement With said other pair of supports and arranged to operate said'valve, a spring connecting the end portions of said levers, the movement of said first mentioned lever serving to move said spring relative to the fulcrum of the other lever, whereby the latter is snap operated, and a cover for said chamber removable independently of said frame.

4. In a thermostat mechanism, the combination with a casing forming a chamber and provided with anf outlet leading therefrom, a valve for controlling the flow of a fluid into said chamber and a thermostatic element, of a frame comprising a pair of spaced side members having upper and lower lateral arms, a cross bar connecting the upper arms together and provided with a pair of spaced bearing edges, a lever having fulcrum engagement with said bearing edges and arranged to be operated by said thermostatic element, a lever having fulcrum engagement with said lower arms and arranged to operate said valve, and a spring connectingthe end portions of said levers, the movement of said rst mentioned lever serving to move said spring relative to the fulcrum of the other lever, whereby the latter is snap operated.

5. In a thermostat mechanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom, a valve for controlling the flow of a fluid into said chamber and a thermostatic element, of a frame mounted in said chamber and comprising a pair of spaced side members having lateral arms at `their upper and lower ends, a lever for operating said valve, said lever having a pair of spaced side of the lever fulcrum, whereby movement of said last mentioned lever will cause said spring to operate said iirst mentioned lever with snap action in either direction.

6. In a thermostat mechanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom, a valve Afor controlling the flow of a fluid into said charnber and a thermostatic element, of a frame mounted in'said chamber and comprising a pair of spaced side members having lateral arms at their upper and lower ends, a main lever fulcrumed at its upperend on said upper arms and arranged to be engaged by said thermostatic element and formed intermediate its ends with an opening, a separate lever fulcrumed at its lower.

end on said lower arms and swingable between said side members and said main lever and provided with a device movable through said opening for engagement with said valve, and a spring connecting the free ends of said levers and normally tending to maintain said levers in engagement with said arms and said main lever inengagementwith said thermostatic element, said main lever being operable to position said spring at either side of the fulcrum for said separate lever to effect snap action thereof.

7. In a thermostat mechanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom, a valve for controlling the flow of a fluid into said chamber and a thermostatic element, of a frame mounted in said chamber and comprising a pair of spaced side members having lateral arms at their upper and lower ends, .a main lever fulcrumed at its upper end on said upper arms and arranged to be engaged by said thermostatic element and formed intermediate its ends with an opening, a separate lever fulcrumed at its lower end on said lower arms and swingable between said side members and said main lever and provided with a device movable through said opening for engagement with said valve, and a spring connecting the free ends of said levers in a plane between said arms and normally tending to maintain said levers in engagement with said arms and' said main lever in engagement with said thermostatic element, said main lever being operable to position said spring at either side of the fulcrum for said separate lever to eiect snap action thereof.

8. In a thermostat mechanism, the combination with a casing forming a chamber and provided wlth an outlet leading therefrom, a valve for controlling the ow of a fluid into said chamber and a thermostatic element, of a frame removably mounted in said chamber, and a leverage, including a spring for eiecting in opposite directions snap action of the lever which operates said valve, mounted in said frame, said element being in engagement with one of said levers and operating through the leverage to support the frame in said chamber, said spring serving to maintain said lever in engagement with said element while permitting said element to eiect operation of said leverage.

9. In a thermostat mechanism, the combination with a casing forming a chamber and provided, with an outlet leading therefrom, a valve for controlling the flow of a fluid into said chamber and a thermostatic element, of a frame cornprising a pair of spaced side members having upper and lower laterally extending portions forming pairs of spaced supports, means for connecting the supports of each pair together, a lever having fulcrum engagement with said upper pair of supports and arranged to be operated by said thermostatic element, a lever having fulcrum engagement with said lower pair of supports and arranged to operate said valve, a spring connecting the end portions of said levers, the movement of said rst mentioned lever serving to move said spring relative to the fulcrum of the other lever, whereby the latter is snap operated, and a device on oneI of said levers disposed between the adjacent supports to prevent lateral movement of the lever.

10.. In a thermostat mechanism, the combination with a casing forming a chamber and provided With an outlet leading therefrom, a valve for controlling the flow of a fluid into said chamber and a thermostatic element, of a frame removably mounted in said chamber and comprising a pair of spaced side members having upper and lower laterally extending portions forming pairs of spaced supports, levers having knife-edge engagement 'with said upper and lower supports, respectively, and a spring connecting the end portions of said levers, one of said levers being arranged to be operated by said thermostatic element and the other lever being arranged to operate said valve, the movement of the lever operated by said element serving to move said spring relative to the fulcrum of the valve operating lever, whereby the latter is snap operated.

1l. In a thermostat mechanism, the combination with a casing forming a chamber and provided with a port, of a spring operated valve for closing said port, a thermostatic element extending into said chamber, and a leverage in Said chamber consisting of a frame within and removably vengaging the Wall of said chamber, a pair of levers fulcrumed at their remote ends in said frame and a spring for connecting the free ends of said levers together, one of said levers being arranged to unseat said valve and the other lever being engaged by said element and said spring normally acting through said other lever in opposition to said element, whereby the latter supports said frame in said chamber with said valve unseating lever in operative relation to said valve.

12. In a thermostat mechanism, the combination with a casing forming a chamber and provided with a port, of a spring operated valve for closing said port, a thermostatic element extending into said chamber, and a leverage in said chamber comprising a frame, a pair of levers fulcrumed at their remote ends in said frame in opposition to said element, whereby the latter supports said leverage in said chamber in operative relation to said valve, and means for adjusting said element endwise.

13. In a thermostat mhanism, the combination with a casing forming a chamber and provided with an outlet leading therefrom, a valve for controlling the flow of a uid into said chamber and a thermostatic element, of a frame comprising a pair of spaced side members" having upper and lower laterally extending portions forming pairs of spaced supports and cross bars connecting the outer ends of the respective portions together, a lever having a fulcrum engagement with said upper pair of supports and arranged to be operated by saidthermostatic element, a lever having fulcrum engagement with said lower pair of supports and arranged to operate said valve, and a spring connecting the end portions of said levers, the movement of said first mentioned lever serving to move said spring relative to the fulcrum of the other lever, Whereby the latter is snap operated, the cross bar for the lower pair of laterally extending portions forming a stop for the rst mentioned lever and said side members forming a stop for the last mentioned lever.

14. A frame for supporting a leverage within a chamber and formed of a single section of sheet metal and comprising spaced parallel side members having at their opposite ends pairs of laterally extending parallel arms, each pair being connected at their outer ends by a cross member, the inner edges of the upper arms adjacent related portions adapted to form fulcrums for related levers.

15. In a valve mechanism, the combination with a casing having a iluid outlet, a thermostat mechanism associated with said casing, a leverage in said casing arranged to be operated by said thermostat mechanism, one wall of said casing being formed with `a valve opening, a wall in concentric relation to said opening and formed with a. valve port, a rotary valve element seated in said wall for opening and closing said port, a member removably mounted in said valve element, and a valve element movably mounted in said rotary valve element for controlling said valve opening and arranged to be operated by said leverage.

16. In a valve mechanism, the combination with a. casing having a fluid outlet, a thermostat mechanism associated with said casing, a leverage in said casing arranged to be operated by said thermostat mechanism, one wall of said casing being formed with a valve opening, a wall in concentric relation to said opening and formed with a valve port, a rotary valve element seated in said wall for opening and closing said port, a member removably mounted in said valve element, and a valve element movably mounted in said rotary valve element for controlling said valve opening and arranged to be operated by said leverage, and means for operating said rotary valve element independently of said other valve element.

FRANK H. SCHOENFELD.

CERTIFICATE or CoRREc'rxoN.

Patent No. 2,011,691. v August zo, 1935.

FRANK H.` SCHOENFELD.

It is hereby certified that error appears in the-printed specification of the above numbered patent requiring correction as follows: Page 2, second'column, line 19, after "of" insert the article a; andy page 5, first column, lines 39 and 62, claims 6 and 7 respectively, strike out the words "and said main lever";l and second column, line 9, claim 8, after ."chambers"A strikeout the comma and insert the Word and; and that the said Letters Patent should vbe read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 24th day of September, A. D. 1935.

Les l ie' Frazer I (Seal) Acting'v Commissioner of Patents. v 

